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q = -2x + 5
p - 2q =
( 5x + 4 ) - 2 ( -2x + 5 ) =
( 5x + 4 ) - ( -4x + 10 ) = 9x - 6
p = 5x + 4
q = -2x + 5
ditanya = p - 2q :...?
jawab :
= p - 2q
= (5x + 4) - 2 (-2x +5)
= (5x + 4) - (-4x + 10)
= 5x + 4 + 4x -10
= 9x - 6